After a brief struggle, the alleged attacker, Carlos Calixto Cruz-Aguilar, seized the boy’s Apple iPhone 5, and took off at about 9:05 a.m., a prosecutor said Friday, revealing new details about the confrontation.

But less than 20 minutes later, Cruz-Aguilar abandoned the cellphone at a Burger King in Waltham as surveillance cameras rolled, a police report said. The surveillance video and a sketch of the suspect were released to the public, and by Thursday night, Cruz-Aguilar, 24, was under arrest.

“This was an allegation of violence unprovoked, violence against a child, against a stranger with the use of a weapon,” Middlesex Assistant District Attorney Mary O’Neill said Friday.

Investigators obtained the Burger King surveillance video that helped catch Cruz-Aguilar after the boy’s grandfather called the stolen cellphone several times following the robbery, according to a police report filed in court. Eventually, a Burger King employee answered the phone and the boy’s father reported the conversation to police, the report said.

Officers retrieved the phone from the restaurant Monday and returned Tuesday to watch surveillance video from the dining area, the report said. The Burger King is about a half-mile from where the robbery occurred. In the video, a man is seen walking into the restaurant at 9:21 a.m. and goes into the restroom. He emerges two minutes later, holding what appears to be a cellphone, and sits at a table, the report said. The man fiddles with the phone for a short time and then rises from his seat, leaving the cellphone on the table before exiting the restaurant.

O’Neill said Cruz-Aguilar likely left the cellphone behind because he could not unlock it.He should have called the FBI!

He was taken into custody Thursday evening in Waltham after a woman told police she saw a man in Waltham Common that resembled the robbery suspect, the police report said.

The man was dressed in clothing similar to what the alleged robber was wearing in the surveillance video, including a pair of black pants with reflective material behind the knee, the report said.

Cruz-Aguilar had a strong odor of alcohol on him and glassy, bloodshot eyes when Waltham officers approached him at about 5:58 p.m. Thursday, the report said. Police took him into protective custody, but later arrested him on an armed robbery charge after the boy who was robbed identified Cruz-Aguilar in a photo array, the report said.

Defense lawyer Arthur Kelly declined to elaborate, but Cruz-Aguilar told officers Thursday night that he wanted to speak with a doctor about the “voices in his head,” the report said.

Cruz-Aguilar has lived in Massachusetts for five or six years and has no criminal record, his lawyer said. He was assisted by a Spanish interpreter in court. Kelly declined to say whether Cruz-Aguilar is a US citizen....That answers the question, doesn't it?He must not want to give illegal immigrants a bad rap.

BRAINTREE — Robert L. Dussourd had been fighting at home with his girlfriend off and on for hours when he was told early Thursday morning to leave their home on Liberty Street.

His girlfriend urged him first, and then her father, Robert Kelley, said he instructed the 44-year-old Dussourd to go.

“She told him he had to leave and then I told him he had to leave and I got him to walk out,” Kelley said Thursday afternoon.

As Dussourd walked into the darkness at about 1:20 a.m., he declared he had a knife and planned to slash his girlfriend’s tires, Kelley said. His daughter then called Braintree police.

Officers arrived with a police dog and found Dussourd hiding under a parked car in the driveway of a neighboring residence on East Division Street, the Norfolk district attorney’s office said.

Police tried to talk Dussourd into surrendering, but he emerged from underneath the car brandishing a knife, which he continued to hold even after officers fired at him with non-lethal bean bags, according to David Traub, a spokesman for District Attorney Michael W. Morrissey.

“I heard someone reply, ‘I have a knife! Just shoot me!’ ” said the neighbor, who asked not to be identified. “Several shots rang out.”

Police shot Dussourd at 2:08 a.m.

Officers tried to save him, but he later died from his injuries at South Shore Hospital in Weymouth, Traub said.

“The information we have at this time indicates that he came out from under the motor vehicle brandishing the knife,’’ he said. “At that time, the officers began what unfortunately proved to be an unsuccessful attempt to deescalate the situation using nonlethal force.’’

In a statement, Morrissey said, “While we are a long way from being done with this investigation, it is important in the case of a police shooting to provide information to the public, even if that information is preliminary in nature. Every police shooting demands a full, deliberate, and fair investigation and that is what we are doing here.”

Kelley said Dussourd had struggled with alcohol and unemployment....Better off dead then.

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